.header{
	width: 100%;
	position: fixed;
	left: 0;
	top: 0;
	height: 1rem;
	line-height: 1rem;
	border-bottom: 1px solid #f5f5f5;
	text-align: center;
	font-size: 0.36rem;
	background: #fff;
	z-index: 101;
}
.header span{
	position: absolute;
	left: 0.5rem;
	top:0.35rem;
	width: 0.36rem;
	height: 0.32rem;
	background: url(../../images/back.png) no-repeat;
	background-size: cover;
}